1. Information and Security Analytics Lecture #1 Unit #1: Data Management: Overview Dr. Bhavani Thuraisingham May 27, 2010

2. 1-2 12/6/2015 15:19 Objective of the Unit 0 This unit provides an overview of the developments in data management. It also provides an overview of data management, information management and knowledge management and illustrates a framework 0 Reference: Data Management Systems: Evolution and Interoperation, Thuraisingham, CRC Press, 1997

3. 1-3 12/6/2015 15:19 Outline of the Unit 0 What is Data Management? 0 Developments in Data Management 0 Current Status and Trends 0 Note on Data Administration 0 Data management, Information management, and Knowledge Management

4. 1-4 12/6/2015 15:19 What is data management 0 One proposal: Data Management = Database System Management + Data Administration 0 Includes data analysis, data administration, database administration, auditing, data modeling, database system development, database application development 0 The tutorial will focus mainly on database system aspects of data management

5. 1-5 12/6/2015 15:19 Developments in Database Systems Network, Hierarchical database systems Relational database systems, transaction processing, distributed database systems Heterogeneous database integration, Migrating legacy databases Next generation database systems: object-oriented, deductive, - - - data warehousing, data mining, multimedia database systems, Internet database

6. 1-6 12/6/2015 15:19 Current Status Database Systems Multimedia Database Systems Data Warehousing Systems Limited integration between the different types of systems Data Mining Systems Sensor Database Systems Heterogeneous Database Systems Often Stovepiped by Technology

7. 1-7 12/6/2015 15:19 Vision for Database Management

8. 1-8 12/6/2015 15:19 Some Outstanding Problems Heterogeneous Database Integration Multimedia Database Management Real-time Database Management Integration with other Technologies Semantic heterogeneity Inferencing Transaction processing Integrity Security Data model Index strategies Synchronization Data manipulation Quality of service Operating system services Transaction processing Active databases Distributed processing Mass storage Information management Knowledge management Migrating Legacy Applications Modernization Enterprise modeling Schema transformation Integration

9. 1-9 12/6/2015 15:19 Some Current Trends in Data Management 0 Heterogeneous database integration -Query, transactions, semantics, security and integrity 0 Migrating legacy databases -Fine-grained encapsulation, distributed objects 0 Multimedia databases -Query, model, quality-of-service, index 0 Data Warehousing -Building a warehouse, query 0 Data Mining -Multimedia databases, web data mining 0 Data management for collaboration -Architecture, transactions 0 Web databases and digital libraries -Query, transactions, index, security

10. 1-10 12/6/2015 15:19 Interoperability of Heterogeneous Database Systems

11. 1-11 12/6/2015 15:19 Note on Data Administration 0 Identifying the data -Data may be in files, paper, databases, etc. 0 Analyzing the data -Is the data of good quality? -Is the data complete? 0 Data standardization -Should one standardize all the data elements and metadata? -Repositories for handling semantic heterogeneity? 0 Data modeling -Structure the data, model the data and the processes

12. 1-12 12/6/2015 15:19 Data, Information and Knowledge Management 0 Data Management -Data: stored in databases, files or some media -Data management includes modeling, storing, retrieving and anbalyzing the data 0 Information Management -Information is what is obtained by making sense out of the data; E.g., Data with context -Information management is about modeling, storing, retrieving and analyzing the information 0 Knowledge Management -Knowledge is what is obtained when the information is understood; it enables one to take actions -Knowledge management is about utilizing the knowledge to improve the business of an organization

13. 1-13 12/6/2015 15:19 Data, Information and Knowledge Management: Alternative View: MITRE Model 1999/2000 Communication, Network, Operating System, Middleware Data Management Information Management Knowledge Management Decision Support

14. 1-14 12/6/2015 15:19 Information and Security Analytics Lecture #1 Unit #2: Database Systems Dr. Bhavani Thuraisingham May 27, 2010

15. 1-15 12/6/2015 15:19 Objective of the Unit 0 This unit will provide an overview of the concepts and developments in database systems 0 Reference: Data Management Systems: Evolution and Interoperation, Thuraisingham, CRC Press, 1997

16. 1-16 12/6/2015 15:19 Outline of the Unit 0 Concepts in database systems 0 Types of database systems

17. 1-17 12/6/2015 15:19 Concepts in Database Systems 0 Definition of a Database system 0 Early systems 0 Metadata 0 Architectural Issues -Schema, Functional 0 DBMS Design Issues 0 Other Issues -Database design, Administration

18. 1-18 12/6/2015 15:19 Database System 0 Consists of database, hardware, Database Management System (DBMS), and users 0 Database is the repository for persistent data 0 Hardware consists of secondary storage volumes, processors, and main memory 0 DBMS handles all users’ access to the database 0 Users include application programmers, end users, and the Database Administrator (DBA) 0 Need: Reduced redundancy, avoids inconsistency, ability to share data, enforce standards, apply security restrictions, maintain integrity, balance conflicting requirements 0 We have used the definition of a database management system given in C. J. Date’s Book (Addison Wesley, 1990)

19. 1-19 12/6/2015 15:19 An Example Database System Adapted from C. J. Date, Addison Wesley, 1990

20. 1-20 12/6/2015 15:19 Early systems: Hierarchical and Network Database Systems Hierarchical Data Model SUPPLIERS SUPPLIES PARTS SUPPLIES SUPPLIERS SUPPLIES PARTS Network Data Model

21. 1-21 12/6/2015 15:19 Metadata 0 Metadata describes the data in the database -Example: Database D consists of a relation EMP with attributes SS#, Name, and Salary 0 Metadatabase stores the metadata -Could be physically stored with the database 0 Metadatabase may also store constraints and administrative information 0 Metadata is also referred to as the schema or data dictionary

22. 1-22 12/6/2015 15:19 Three-level Schema Architecture: Details External Schema A External Schema B Conceptual Schema Internal Schema User A1 User A2User A3User B1 User B2 External Model A External Model B Conceptual Model Stored Database Internal Model External/Conceptual Mapping B External/Conceptual Mapping A Conceptual/Internal Mapping

23. 1-23 12/6/2015 15:19 Functional Architecture User Interface Manager Query Manager Transaction Manager Schema (Data Dictionary) Manager (metadata) Security/ Integrity Manager File Manager Disk Manager Data Management Storage Management

24. 1-24 12/6/2015 15:19 DBMS Design Issues 0 Query Processing -Optimization techniques 0 Transaction Management -Techniques for concurrency control and recovery 0 Metadata Management -Techniques for querying and updating the metadatabase 0 Security/Integrity Maintenance -Techniques for processing integrity constraints and enforcing access control rules 0 Storage management -Access methods and index strategies for efficient access to the database

25. 1-25 12/6/2015 15:19 Other Issues 0 Database design -Generally a two-step process =Semantic data model to capture the entities of the application and the relationships between the entities =Generate the conceptual schema; theory of normal forms for relational databases -Research on object-oriented approaches for database design 0 Database Administration -Creating and deleting databases; backup and recovery, enforcing policies, auditing, etc.

26. 1-26 12/6/2015 15:19 Types of Database Systems 0 Relational Database Systems 0 Object Database Systems 0 Deductive Database Systems 0 Other -Real-time, Secure, Parallel, Scientific, Temporal, Wireless, Functional, Entity-Relationship, Sensor/Stream Database Systems, etc.

27. 1-27 12/6/2015 15:19 Relational Database: Informal Overview 0 Collection of tables also called relations 0 Table has one or more columns also called attributes 0 Each table has zero or more rows also called tuples 0 Elements of a row take values from a pool of legal values 0 The values of one or more columns in a row uniquely identify the row. These columns form an identifier (also called key) 0 One identifier is designated as the unique identifier (also called primary key) 0 Querying relational databases using language called SQL (Structured Query Language)

28. 1-28 12/6/2015 15:19 Relational Database: Example Relation S: S# SNAME STATUS CITY S1 Smith 20 London S2 Jones 10 Paris S3 Blake 30 Paris S4 Clark 20 London S5 Adams 30 Athens Relation P: P# PNAME COLOR WEIGHT CITY P1 Nut Red 12 London P2 Bolt Green 17 Paris P3 Screw Blue 17 Rome P4 Screw Red 14 London P5 Cam Blue 12 Paris P6 Cog Red 19 London Relation SP: S# P# QTY S1 P1 300 S1 P2 200 S1 P3 400 S1 P4 200 S1 P5 100 S1 P6 100 S2 P1 300 S2 P2 400 S3 P2 200 S4 P2 200 S4 P4 300 S4 P5 400

29. 1-29 12/6/2015 15:19 SQL: Data Manipulation 0 Select, Update, Delete, Insert Examples: SELECT S.S#, S.STATUS FROM S WHERE S.CITY = Paris SELECT * FROM S SELECT S.*, P.* FROM S, P WHERE S.CITY = P.CITY UPDATE P SET COLOR = ‘Yellow’ WEIGHT = WEIGHT + 5 CITY = NULL WHERE P# = P2

30. 1-30 12/6/2015 15:19 Features of Object-Oriented Database Systems Suitable for Advanced Applications 0 Objects (support for large and variable sized data blocks) 0 Class hierarchy (reusability) 0 Instance variables, composite and complex objects (complex data structures) 0 Methods, and message passing (object encapsulation) 0 Pointer swizzling (performance) 0 Tighter integration with programming languages (application program support) 0 Special mechanisms for long transactions and concurrency control, multimedia information management, schema management, versions management, storage management

31. 1-31 12/6/2015 15:19 Concepts in Object Database Systems 0 Objects- every entity is an object -Example: Book, Film, Employee, Car 0 Class -Objects with common attributes are grouped into a class 0 Attributes or Instance Variables -Properties of an object class inherited by the object instances 0 Class Hierarchy -Parent-Child class hierarchy 0 Composite objects -Book object with paragraphs, sections etc. 0 Methods -Functions associated with a class

32. 1-32 12/6/2015 15:19 Example Class Hierarchy Document Class D1 D2 Book Subclass B1 # of Chapters Volume # Print-doc-att(ID) Method1 : Journal Subclass J1 Print-doc (ID) Method2: ID Name Author Publisher

33. 1-33 12/6/2015 15:19 Example Composite Object Composite Document Object Section 1 Object Section 2 Object Paragraph 1 Object Paragraph 2 Object

34. 1-34 12/6/2015 15:19 Deductive Database Systems 0 Database systems augmented with inference engines to deduce new data from existing data and rules 0 Example -Rule: parent of a parent is a grandparent -Data: John is Jane’s parent; Jane is Robert’s parent -From the above, infer John is Robert’s grandparent 0 Loose and tight coupling architectures between the database system and inference engine

35. 1-35 12/6/2015 15:19 Current Status 0 Database Systems is a mature technology; numerous products and prototypes 0 Much work followed in distributed and heterogeneous databases 0 Current directions include web database management as well as data management support for novel applications including E-commerce, Bioinformatics and Geoinformatics 0 Work still continues on developing new kinds of database systems including stream/sensor database systems

36. 1-36 12/6/2015 15:19 Information and Security Analytics Lecture #1 Unit #3: Distributed and Heterogeneous Database Systems Dr. Bhavani Thuraisingham May 27, 2010

37. 1-37 12/6/2015 15:19 Objective of the Unit 0 This unit provides an overview of concepts in distributed and heterogeneous databases. In particular, definitions and functions, are discussed 0 Reference: -Data Management Systems: Evolution and Interoperation, Thuraisingham, CRC Press, 1997 -Heterogeneous Information Exchange and Organizational Hubs, Kluwer, 2002, Editors: Bestougeff, Dubois and Thuraisingham

38. 1-38 12/6/2015 15:19 Outline of the Unit 0 Distributed Database Systems -Architecture, Data Distribution, Functions 0 Heterogeneous Database Integration 0 Federated Database Management 0 Client-Server Database Management 0 Migrating Legacy Databases 0 Current Status and Directions

39. 1-39 12/6/2015 15:19 A Definition of a Distributed Database System 0 A collection of database systems connected via a network 0 The software that is responsible for interconnection is a Distributed Database Management System (DDBMS) 0 Each DBMS executes local applications and should be involved in at least one global application (Ceri and Pelagetti) 0 Homogeneous environment

40. 1-40 12/6/2015 15:19 Architecture Communication Network Distributed Processor 1 DBMS 1 Data- base 1 Data- base 3 Data- base 2 DBMS 2 DBMS 3 Distributed Processor 2 Distributed Processor 3 Site 1 Site 2 Site 3

41. 1-41 12/6/2015 15:19 Distributed Processor Distributed Query/Update Processor Distributed Transaction Manager Distributed Metadata Management Network Interface Local DBMS Interface Integrity/ Security Manager

42. 1-42 12/6/2015 15:19 Data Distribution EMP1 SS#NameSalary 1John20 2Paul30 3James40 4Jill50 60 5Mary 6Jane70 D# 10 20 20 20 10 20 DnameD#MGR 10 30 40 Jane David Peter DEPT1 SITE 1 SITE 2 EMP2 SS#NameSalary 9Mathew 70 D# 50 Dname D#MGR 50 Math John Physics DEPT2 David 80 30 Peter9040 7 8 C. Sci. English French 20 Paul

43. 1-43 12/6/2015 15:19 Distributed Database Functions 0 Distributed Query Processing -Optimization techniques across the databases 0 Distributed Transaction Management -Techniques for distributed concurrency control and recovery 0 Distributed Metadata Management -Techniques for managing the distributed metadata 0 Distributed Security/Integrity Maintenance -Techniques for processing integrity constraints and enforcing access control rules across the databases

44. 1-44 12/6/2015 15:19 DBMS 1 DQP DBMS 2 DQP DBMS 3 EMP1 (20) EMP2 (30) DEPT2 (20) EMP1 (20) EMP3 (50) DEPT3 (30) Network Query at site 1: Join EMP and DEPT on D# Move EMP2 to site 3; Merge EMP1, EMP2, EMP3 to form EMP Move DEPT2 to site 3; Merge DEPT2 and DEPT3 to form DEPT Join EMP and DEPT; Move result to site 1 Query Processing Example (Concluded) DQP (Distributed Query Processor)

45. 1-45 12/6/2015 15:19 Transaction Processing Example Site 1 Coordinator Transaction Tj Site 2 Participant Site 3 Participant Site 4 Participant Subtransaction Tj2 Subtransaction Tj3 Subtransaction Tj4 Issues: Concurrency control Recovery Data Replication Two-phase commit: Coordinator queries participants whether they are ready to commit If all participants agree, then coordinator sends request for the participants to commit DTM (Distributed Transaction Manager) responsible for executing the distributed transaction

46. 1-46 12/6/2015 15:19 Interoperability of Heterogeneous Database Systems Database System A Database System B Network Database System C (Legacy) Transparent access to heterogeneous databases - both users and application programs; Query, Transaction processing (Relational) (Object- Oriented)

47. 1-47 12/6/2015 15:19 Technical Issues on the Interoperability of Heterogeneous Database Systems 0 Heterogeneity with respect to data models, schema, query processing, query languages, transaction management, semantics, integrity, and security policies 0 Interoperability based on client-server architectures 0 Federated database management -Collection of cooperating, autonomous, and possibly heterogeneous component database systems, each belonging to one or more federations

48. 1-48 12/6/2015 15:19 Different Data Models Node A Node B Database Relational Model Network Model Node C Database Object- Oriented Model Network Node D Database Hierarchical Model Developments: Tools for interoperability; commercial products Challenges: Global data model

49. 1-49 12/6/2015 15:19 Schema Integration and Transformation: An approach Schema describing the network database Schema describing the hierarchical database Schema describing the object-oriented database Global Schema: Integrate the generic schemas External Schema I External Schema II External Schema III Schema describing the relational database Generic schema describing the relational database Generic schema describing the network database Generic schema describing the hierarchical database Generic schema describing the object-oriented database Challenges: Selecting appropriate generic representation; maintaining consistency during transformations; schema evolution

50. 1-50 12/6/2015 15:19 Semantic Heterogeneity 0 Semantic heterogeneity occurs when there is a disagreement about the meaning or interpretation of the same data Object O Node A Node B Database Object O interpreted as a passenger ship Object O interpreted as a submarine Challenges: Standard definitions; Repositories

51. 1-51 12/6/2015 15:19 Federated Database Management Database System A Database System B Database System C Cooperating database systems yet maintaining some degree of autonomy Federation F1 Federation F2

52. 1-52 12/6/2015 15:19 Autonomy Component A Component B Component C local request request from component communication through federation component A does not communicate with component C component A honors the local request first Challenges: Adapt techniques to handle autonomy - e.g., transaction processing, schema integration; transition research to products

53. 1-53 12/6/2015 15:19 Schema Integration and Transformation in a Federated Environment Adapted from Sheth and Larson, ACM Computing Surveys, September 1990 Component Schema for Component A Component Schema for Component B Component Schema for Component C Local Schema 1 Local Schema 2 Generic Schema for Component A Generic Schema for Component B Generic Schema for Component C Export Schema for Component A Export Schema I for Component B Export Schema for Component C Federated Schema for FDS - 1 Federated Schema for FDS - 2 External Schema 1.2Schema 2.1 External Schema 2.2 External Schema 1.1 Export Schema II for Component B External

54. 1-54 12/6/2015 15:19 Security Policy Integration

55. 1-55 12/6/2015 15:19 Federated Data and Policy Management Export Data/Policy Component Data/Policy for Agency A Data/Policy for Federation Export Data/Policy Component Data/Policy for Agency C Component Data/Policy for Agency B Export Data/Policy

56. 1-56 12/6/2015 15:19 Client-Server Architecture: Example Network Client from Vendor A Client from Vendor B Server from Vendor C Server from Vendor D Database

57. 1-57 12/6/2015 15:19 Remote Database Access (RDA) Model RDA Service Provider RDA Client RDA Server Database RDA Client Interface RDA Server Interface Interface between client and service provider can operate in synchronous or asynchronous modes

58. 1-58 12/6/2015 15:19 Example Three-Tier Architecture Client: User Interface Processing Server: Local DBMS Network Intermediate: Distributed Processor, Business Rules, Logic

59. 1-59 12/6/2015 15:19 Object-based Interoperability Object Request Broker Client Object Server Object Example Object Request Broker: Object Management Group’s (OMG) CORBA (Common Object Request Broker Architecture)

60. 1-60 12/6/2015 15:19 Javasoft’s RMI (Remote Method Invocation) RMI Business Objects Clients Java-based Servers

61. 1-61 12/6/2015 15:19 Microsoft’s Open Database Connectivity DBMS Vendor B Microsoft’s ODBC DBMS Vendor A ODBC Driver for DBMS A Database A B ODBC Driver for DBMS B Microsoft Application C Microsoft Application D

62. 1-62 12/6/2015 15:19 Overview: Migrating Legacy Systems 0 Many of the current systems and applications may become obsolete 0 Need an approach to migrate these systems to new architectures 0 Evolutionary approach: incremental transition of today's systems into more flexible systems 0 Extensible system architecture ultimately replaces today's hardware and software architecture 0 Open systems approach, standards

63. 1-63 12/6/2015 15:19 Migrating Legacy Database and Applications 0 Build business model in a sub-domain and relate data to existing databases and systems. 0 Wrap existing systems to provide access as needed. 0 Incorporate middle tier services and begin migrating workflow. 0 Gradually migrate business logic and rely on business objects for end-user systems.

64. 1-64 12/6/2015 15:19 Migrating Business Logic container middle tier business objects data entry Airspace Airspace2 Airspace3 Airspace4 Airspace5 timeturnpointsElevations xx,xx,xx nn:nn xx,xx,xx Etc.... visualization client tier blah,blah,blah,blah,blah,blah,blah, word processing existing databases Airspace Airspace2 Airspace3 Airspace4 Airspace5 timeturnpointsElevations xx,xx,xx nn:nn xx,xx,xx Etc.... server tier existing systems existing processes blah,blah,blah,blah,blah,blah,blah, EDI Artifacts distribution services CORBA business logic

65. 1-65 12/6/2015 15:19 Data Sharing databases Airspace Airspace2 Airspace3 Airspace4 Airspace5 timeturnpointsElevations xx,xx,xx nn:nn xx,xx,xx Etc.... forms Airspace Airspace2 Airspace3 Airspace4 Airspace5 timeturnpointsElevations xx,xx,xx nn:nn xx,xx,xx Etc.... map display 4D display blah,blah,blah,blah,blah,blah,blah, data model middle tier data access client tier server tier existing systems mediation data access databases Airspace Airspace2 Airspace3 Airspace4 Airspace5 timeturnpointsElevations xx,xx,xx nn:nn xx,xx,xx Etc.... blah,blah,blah,blah,blah,blah,blah, data model

66. 1-66 12/6/2015 15:19 Application vs. Database Migration 0 Extract schema from the legacy code -Use reengineering tools 0 Extract metadata associated with the data 0 Deal with incomplete data and fill in the gaps 0 Build schemas in the target system from the extracted schema 0 Build the database

67. 1-67 12/6/2015 15:19 Example: Legacy Migration using Objects CTAPS - Contingency Theater Automated Planning System Application InterfacesDomain InterfacesCommon Facilities Object Services Object Request Broker Targetting Planning/ATO Collection Mgt... MCG&I Messaging Weather... User Interface Compound Data System & Task Mgt... Security Concurrency Transactions...

68. 1-68 12/6/2015 15:19 Example Lessons Learned: Experience with CORBA 0 CORBA provides an evolvable system integration platform 0 CORBA provides a path for legacy migration -Applications can be coarsely wrapped as CORBA objects, providing 100% reuse =Wrapping is a relatively straight forward technique =Need to dig to uncover hidden dependencies =Does not address duplication of common functions -Applications can be reengineered to replace duplicated functions with CORBA based common services =Substantially more difficult than coarse wrapping

69. 1-69 12/6/2015 15:19 Example: Migration using Object for Real-time Systems Technology provided by Project Hardware Display Processor & Refresh Channels Consoles (14) Navigation Sensors Data Links Data Analysis Programming Group (DAPG) Future App Future App Future App Multi-Sensor Tracks Sensor Detections Real Time Operating System MSI App Data Mgmt. Data Xchg. Infrastructure Services Interface to DAPG, etc., will be simulated for project demonstration

70. 1-70 12/6/2015 15:19 Current Status and Directions 0 Developments -Several prototypes and some commercial products -Tools for schema integration and transformation -Standards for interoperable database systems 0 Challenges being addressed -Semantic heterogeneity -Autonomy and federation -Global transaction management -Integrity and Security 0 New challenges -Scale -Web data management

71. 1-71 12/6/2015 15:19 Information and Security Analytics Dr. Bhavani Thuraisingham The University of Texas at Dallas Lecture #1 Unit #4 Data Warehousing May 28, 2010

72. 1-72 12/6/2015 15:19 Outline 0 Data Warehousing 0 Data Warehouse to Data Mining

73. 1-73 12/6/2015 15:19 What is a Data Warehouse? 0 A Data Warehouse is a: -Subject-oriented -Integrated -Nonvolatile -Time variant -Collection of data in support of management’s decisions -From: Building the Data Warehouse by W. H. Inmon, John Wiley and Sons 0 Integration of heterogeneous data sources into a repository 0 Summary reports, aggregate functions, etc.

74. 1-74 12/6/2015 15:19 Example Data Warehouse Oracle DBMS for Employees Sybase DBMS for Projects Informix DBMS for Medical Data Warehouse: Data correlating Employees With Medical Benefits and Projects Could be any DBMS; Usually based on the relational data model Users Query the Warehouse

75. 1-75 12/6/2015 15:19 Some Data Warehousing Technologies 0 Heterogeneous Database Integration 0 Statistical Databases 0 Data Modeling 0 Metadata 0 Access Methods and Indexing 0 Language Interface 0 Database Administration 0 Parallel Database Management

76. 1-76 12/6/2015 15:19 Data Warehouse Design 0 Appropriate Data Model is key to designing the Warehouse 0 Higher Level Model in stages -Stage 1: Corporate data model -Stage 2: Enterprise data model -Stage 3: Warehouse data model 0 Middle-level data model -A model for possibly for each subject area in the higher level model 0 Physical data model -Include features such as keys in the middle-level model 0 Need to determine appropriate levels of granularity of data in order to build a good data warehouse

77. 1-77 12/6/2015 15:19 Distributing the Data Warehouse 0 Issues similar to distributed database systems Distributed Warehouse Central Bank Branch ABranch B Central Warehouse Central Bank Branch A Branch B Central Warehouse Branch B Warehouse Branch A Warehouse Non-distributed Warehouse

78. 1-78 12/6/2015 15:19 Multidimensional Data Model

79. 1-79 12/6/2015 15:19 Indexing for Data Warehousing 0 Bit-Maps 0 Multi-level indexing 0 Storing parts or all of the index files in main memory 0 Dynamic indexing

80. 1-80 12/6/2015 15:19 Metadata Mappings

81. 1-81 12/6/2015 15:19 Data Mining Knowledge Mining Knowledge Discovery in Databases Data Archaeology Data Dredging Database Mining Knowledge Extraction Data Pattern Processing Information Harvesting Siftware The process of discovering meaningful new correlations, patterns, and trends by sifting through large amounts of data, often previously unknown, using pattern recognition technologies and statistical and mathematical techniques (Thuraisingham 1998)